NACE MR0103 Globe Valves
What NACE MR0103 requires for globe valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does NACE MR0103 require for globe valves?
NACE MR0103 (Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refinery Environments, NACE International (now AMPP)) sets the design, material and testing requirements for globe valves in its scope. NACE MR0103 specifies the metallurgical requirements for materials used in petroleum refinery environments where wet hydrogen sulfide (H₂S) can cause sulfide stress cracking (SSC). While the related standard NACE MR0175 (ISO 15156) applies to upstream oil and gas production environments, MR0103 covers the specific conditions found in refinery process streams - typically higher temperature, lower pH, and different H₂S partial pressures. Both standards may be co-specified on the same valve for refinery projects.
Applicable Pressure Classes
Key Requirements
- Carbon steel hardness limit: ≤22 HRC (Rockwell C) for base metal and welds
- Heat treatment: PWHT (Post Weld Heat Treatment) required for carbon and low-alloy steel valves
- Maximum yield strength for carbon steel: 90 ksi (620 MPa) in most conditions
- Austenitic stainless steels: cold worked material hardness ≤22 HRC
- Nickel alloys: Alloy 625, Alloy C-276 permitted in specific tempers
- Hardness testing: Brinell (HBW) or Rockwell (HRC) at critical locations
- Excludes high-strength steels like AISI 4140 in quenched and tempered condition
Testing Requirements
- Brinell or Rockwell hardness testing of body, bonnet, and trim
- PWHT verification by hardness test
- Traceability to heat treatment records
Alternative Standards for Globe Valves
Other standards that also govern globe valves — useful for spec cross-acceptance.
Related Standards
Connected Engineering
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